Fuel pressure reading half.

[RV8iator]

To the collective group..
Old fuel pressure sender for injected 360 started reading intermittently high. I’ve been through several over the past 16 years and 3200+ hours. Always the same VDO 2 bar units. Some with ground wire, some without.
My latest unit from Vans, correct part, without ground stud, now reads exactly half of normal all the time.
Other than a bad unit out of the bag, any other ideas?

 

[TS Flightlines]

Hey Widget---connet a direct reading guage to verify the actual fuel pressure first--

Tom

 

[RV8iator]

Hey Widget---connet a direct reading guage to verify the actual fuel pressure first--

Tom

Did that. Pressure’s normal. Sender reads exactly half of real pressure. Wondering if lack of ground is the problem. Sender has a cover over where the ground stud is. Will see if I can remove and put a ground lug in. ‘
I'm thinking it's a faulty new unit. I have another extra but just wondering if any other way to make it work maybe. Hate throwing money in the trash.